I have been playing for about 10 years now, and I have heard a whole lot of players that seems to emphasize the first syllable of every card. Like "DOMri Rade" and "RAging Ravine". And the pitch of the voice always resembles that of a question, if that makes sense. I was just curious when this started and why everyone does it.
Sorry if it doesn't make any sense, I just notice it a lot.

Oh.. to ask it resolves... after getting FOWed for ten years. I might announce my spell as a question, and to indicate passing of priority. is that what you mean? if they do it when just talking about the card thats weird.

Not really sure about the pronunciation part, but people always seem to have wildly different pronunciations for different cards, some right and some wrong. As for people sounding like they're asking questions, it's likely a habit that a lot of players form. Let's say I'm casting a Domri Rade. Normally, I would say "Domri Rade. Does it resolve?", but to shortcut a bit, I usually just go with saying "Domri Rade?", and your opponent says "Yep" or "Nope" depending on whether they're responding to it or not.

They do it on the commentary a lot too. It gets on my nerves. But i think i understand how it came about. MtG often uses a card naming pattern where the first word is an adjective and the second is a noun that's used on many cards (typically but not always a creature type). In such a case, the first syllable carries the most information about which particular card we are talking about, and then once people start emphasizing names that way it just gets to be the way you talk about the cards.

I actually do know what the OP is talking about, I have noticed an over-stressing of the first syllable before. It's probably just because some people take cards too seriously and this is associated with the stressing of the first syllable